Buddy, I am a noob in libvirt develop.

When I want to create a domain by using virDomainDefineXML and displays a window on the host desktop. But when I add the line 

" <graphics type='sdl' display=':0.0'/>"  into the config xml file, the error as below will happen. 

libvir: QEMU error : internal error process exited while connecting to monitor: Could not initialize SDL(No available video device) - exiting

when I delete " <graphics type='sdl' display=':0.0'/>",I can create the domain normally. Who can help me?! 

The config xml file is as below:

<domain type='qemu'>

  <name>qemu_ubuntu_01</name>

  <memory>219200</memory>

  <currentMemory>219200</currentMemory>

  <vcpu>2</vcpu>

  <os>

    <type arch='x86_64' machine='pc'>hvm</type>

    <boot dev='hd'/>

    <boot dev='cdrom'/>

  </os>

  <devices>

    <emulator>/usr/bin/qemu</emulator>

    <disk type='file' device='cdrom'>

      <source file='/root/Downloads/ubuntu-11.04-desktop-amd64.iso'/>

      <target dev='hdc' bus='ide'/>

      <readonly/>

    </disk>

    <disk type='file' device='disk'>

      <source file='/var/lib/libvirt/images/winXP.img'/>

      <driver name='qemu' type='raw'/>

      <target dev='hda'/>

    </disk>

    <video>

      <model type='cirrus' vram='9216' heads='1'>

       <acceleration accel3d='yes'/>

      </model>

    </video>

    <interface type='bridge'>

      <mac address='52:54:00:d8:65:c9'/>

      <source bridge='virbr0'/>

    </interface>

    <input type='mouse' bus='ps2'/>

    <graphics type='vnc' port='10' listen='127.0.0.1'/>

    <graphics type='sdl' display=':0.0'/>

  </devices>

 </domain>

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